Intensity of Sound: What is the ratio of the intensities of two sounds with intensity levels of 70 dB and 40 dB?
A. 10:1
B. 100:1
C. 1000:1
D. 10,000:1
Answer: C
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Geologists think that Earth is how old?
a. 4560 billion years b. 45.6 thousand years c. 45.6 million years d. 4.56 billion years
A parachutist jumps out of an airplane and accelerates with gravity to a maximum velocity of 58.8 m/s in 6.00 seconds. She then pulls the parachute cord and after a 4.00-second constant deceleration, descends at 10.0 m/s for 80.0 seconds, reaching the ground. From what height did the parachutist jump?
a. 914 m c. 1520 m b. 1110 m d. 1750 m
Sunspot numbers follow a seven-year cycle
a. True b. False Indicate whether the statement is true or false
Why has star formation ceased in the galactic halo?
A) The halo has no gas at all. B) There are no white dwarf binaries to trigger star formation via their supernovae. C) All the halo gas consists of elements with more protons than helium. D) All of the galaxy's cool gas settled to the galactic plane long ago.